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    Algebraic simplification problem after a u-substitution derivation

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    The attached file contains a function that needs to have the first order derivative taken. I took the derivative, but I am making a mistake in the algebra simplification of the result. Would you please take a look.

    I am working on a dynamic programming problem, and one part of it requires that I take the derivative of the function.

    Below is the work that I did.

    My study partner worked it out like this:

    I think there is a sign mistake in my partner's work. He thinks there is a sign mistake in mine.

    Would you work the problem and let me see where the mistake is?

    © BrainMass Inc. brainmass.com February 24, 2021, 2:22 pm ad1c9bdddf
    https://brainmass.com/math/basic-algebra/algebraic-simplification-problem-after-substitution-derivation-16689

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    There's a mistake in your partner's work:
    From ... f '(x) = 4x + [ (2/5) * ...

    Solution Summary

    The algebraic simplification problem for after u-substitution derivations are determined.

    $2.19

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